Couplings in Angel's Feather

The good news is the system for setting up the couplings you're after is pretty straight forward. No difficult questions or scenarios to navigate like in a click-manga. Just (as the seme) pay lots of visits to the character you're targeting for uke. The exception is Shion couplings. Shion can only be the seme, and you don't have the opportunity to make visits as him until Chapter 9. So for Shion X whoever, visit him as the uke. (There are a couple other exceptions mentioned below.)

The game makers classify the couplings as proceeding in 3 stages. These are:
Stage 1- Kiss
Stage 2- Confessions in the other world
Stage 3- The last night

To reach stage 1, you must have the sentiment meter towards that uke at a minimum of 2. You raise the sentiment meter by visiting that person during your free time. Usually you can only raise the meter one level per scene during the noontime breaks at school, no matter how many times you go see them, and up to two times (if you visit twice) at night in the dorm. Your Nozoki (peeping) level also needs to be at least 1 (which, obviously, you raise by witnessing the various Nozoki scenes at school and in the dorm.) All stage 1 events happen at the dorm. Most also will only happen during certain chapters (usually 4 and/or 6). Once the requirements are met, if you visit the target in the dorm, they will ask you if you want to stay and talk a little longer. If you choose yes (almost always the first option) a kiss CG will ensue. Note that the visit which causes the CG counts towards fulfilling the requirements. Once you reach stage 1 with a character, they will be unavailable for other couplings. (I have reached stage 1 concurrently with 2 different Shion X couplings, so he may be a different case.)

After reaching stage 1, at the beginning of Chapter 9 (the first night you spend at the Inn in Wingfield), there will be a CG of the characters thinking about eachother. If you have more than one couple who has reached stage 1 (which is possible), you will get one per night at the Inn until they're all done.

Once the "thinking of eachother" CG's happen, (and not before) you can proceed to Stage 2. Visit the uke as the seme in the Inn. The other requirements here are Sentiment meter 5+, and Nozoki meter 1+. Note that you do NOT have to go out on a quest to advance the couplings. You can immediately go back to Wingfield and spend another night in the Inn. Also, visits in the Inn count towards raising your sentiment meter. Things will proceed similarly to Stage 1, just talk to them again. This time, the characters will confess their feelings for eachother, and a yaoi scene will ensue. (Though they don't go all the way.) The coupling is now at stage 2. You can reach stage 2 with any number of couples that were previously at Stage 1, any time before the last night (which occurs after meeting the Sacred Spirit of the Moon). However, there are some events that will not happen unless a couple has reached Stage 2.

You can only get one couple to Stage 3 per game play. Just visit the uke again on your last night in Wingfield. Another yaoi scene will occur, and if you beat the game, after the closing credits, you will see epilogue CG's about them.

The complete list of couplings is:

Shou x Kai !
Shou x Sena !
Shou x Anri !
Kai x Shou !
Kai x Anri
Kai x Sena
Chris x Shou
Chris x Kai
Chris x Sena
Chris x Anri
Chris x Shion !*
Sena x Chris
Sena x Shou !
Sena x Kai !
Sena x Anri
Shion x Shou
Shion x Kai
Shion x Chris A !*
Shion x Chris B !*
Shion x Sena*
Shion x Anri
Naoto x Shou *
Nagi x Kai *

* Indicates a couple where the conditions are slightly different than normal
! Indicates a couple where an event will occur if Stage 2 coupling is reached by a certain point. (See below.)

Special Conditions

Coupling	Condition
Chris x Shion	Continue to visit Shion as Chris rather than Shion once you reach Wingfield. Obtain the mine event in the next table; do not do the city event.
Shion x Chris A	Obtain the Shion x Chris event in the city. Epilogue is the same as if you got no events.
Shion x Chris B	Do not do either event below (Note if you get the mine event, the yaoi scene will be the same, but the epilogue will be the same as Chris x Shion.)
Shion x Sena	Due to a glitch, you will get a second kiss scene in Wingfield before you can go to Stage 2
Naoto x Shou	Requires sentiment meter 4+ This means all 4 chances to see Naoto, including 2 trips to the Kendo room after the battle with him.
Nagi x Kai	Stage 1 occurs the night of Chapter 5, and go straight to Stage 3 in Chapter 6.

To obtain the following events, the requisite coupling must be at Stage 2 before you head to the location.

Coupling	Location
Shou x Sena	Volcano/ Spirit of Fire
Shou x Anri	Forest/ Spirit of Wood
Shion x Chris or Chris x Shion	Mine/ Spirit of Gold Once this event happens, the epilogue will change to the alternate, regardless of whether you also get the city event.
Sena x Kai	Water Shrine/ Spirit of Water
Kai x Shou or Shou x Kai	Desert/ Spirit of Earth
Sena x Shou	Ocean/ Spirit of the Moon
Shion x Chris or Chris x Shion	City (any time). As Shion, go visit Chris. Will not work once/if mine event is obtained.