Hi,
1. Unfortunately there's no gallery right now, dev has plans to add it in some near future update, not sure when exactly tho, for now, you'll have to either reload a save from before or start a new game.
2. Lvl 80 relationship has already been added in some previous build, before the rel 100 event, you need to have 80 rel and go running together with Yuna, there's just a chance for it to occur, location doesn't matter (if you haven't got it, hen RNGesus hasn't been merciful to you...).
3. The morning wake up sequence is a part of rel 100 event, it's a little different from just the nightly wake-up. To get the morning one, simply have rel 100, proceed to the night as usual, do anything to wake her up (this is the nightly one) and then wait for 5mins so the night shifts to morning, if you haven't seen the event then it should occur, if you've seen it then the adventure just ends.
4. Definately there will be more interactions with Kaede, dev has already plans to add sleeping bag sex, where mc will unzip it a little from the back to get "access" to her holes. Scenes/events will probably added as well.
5. Some people requested different positions such as prone bone or spooning, don't count on cowgirl or other Kamasutra positions, as...well....she's usually pretty much asleep, her waking up during the night when rel is 100 is in fact a sort of continue after game over, as you don't get any credits for the night she wakes up and the game revolves mainly around sleep sex.
6. The party event is finished, dev will add some events connected to what was being said during the party, like meeting in a park with Yosuke (orange hesdphones guy) and others.
Hope this answers,
Cheers
P.S. If you'd like to know more about the game, items, mechanics, NPCs, then I highly suggest checking out our Wiki (still WIP tho)