what is this Bridal Carry stuff with your partner
You can only do it at Mood Level 5 onwards. Don't attempt it at any other stages if not their mood will reset back to zero.
Also, if you are bridal carrying the girls, make sure that you are not seen by the other female leads, if not their mood will reset to zero.
Here's what I usually do:
If I'm not wrong Vita R2 button is for "right!" or whatsoever, O button is for the passive responses.
Sit with them at the benches around the teleport gate:
When they talk about "...legendary bench/table" or whatever hit O. Most of the other answers you can just answer with R2 which lead to more affection points gained.
Your point is to fill the affection bar by using your limited energy talk bar (which will increase the higher friendship level you have with the heroine) the correct answers so that it fills out and progress to the next level. Should you fail though, don't worry. They will gain some friendship exp as well.
If benches don't work, I find Kirito's rooom to be a very good place for conversations as well, it's easy because most of the responses are "right!", except for the "...the two of us" thingy.
Once you get their mood to level 5, this is what you need to do to get to
sexy time bed talk.
Best place to do so is Kirito's room. Once you get them to level 5 [Mood=In Love], exit your room so that you go to level 1 of the Inn. Proceed to talk to partner character and select bridal carry with them (other heroines will start walking into the inn so act fast!).
Once you bridal carry them, their mood will change to Level 6 [Infatuated]
DO NOT CHANGE CAMERA CAMERA OR WHATSOEVER JUST IN CASE YOU WANT A CLOSER LOOK AT THEM OR PEEK UP THEIR SKIRTS. CHANGING CAMERA ANGLE MIGHT CAUSE THEM TO LOSE THEIR AFFECTION, PUTTING YOU BACK AT STAGE ZERO.
Bridal carry them up the stairs->screen change to Kirito's room and their mood will automatically change to "Lost"
Carry them near the bed and they will indicate they want to lie down on the bed.
It will then change into yet another conversation when you need to fill the affection gauge. Fill it to the max and you will unlock a scene with the heroine (there are three different scenarios from the last time I tried it with Strea)