1: Missionary, cowgirl, 69ing, ball-sucking and analingus. Would not like to top Asterion as it can be painful when you're not used to it, hurting the moo is a no-no
2 and 3: I'd like to see lots of campy innuendo stuff between MC and Asterion like you see in the Carry On movies. Lots of double entendres.
4: Turkish style bath-house, or anything with a large body of water that allows for underwater sex
5: Anything I doubt Asterion wants to do, I wouldn't want to do, stuff that involves pain or even roleplaying with Asterion in a subservient position like a maid. I want him to be empowered. I also don't want body modification as I want Asterion to be "himself"
6: I'd like to see MC put his fingers in Asterions mouth, or have Asterion suck his thumb during sex, I find that insanely hot
7: Scooping up MC in his arms like a baby, marching down the hall, kicking open the door to the bedroom, and the rest writes itself
8: I want to say wrestling, but the wrestling scene in the original labyrinth didn't feel like it was sexually motivated on Asterions part, so I'm not sure. Aside from that, nipple-play
Expanding on points two and three, I think a scene that's similar to this sketch would be funny, where MC and Asterion are flirting, and then Luke come in and ruins everything