In keeping things simple and enjoyable:
1. Definitely missionary, while staring into each others eyes.
A) as a kink, neck biting
2. Fingering is always a plus in media
3. Nipple biting, using his furry body to rub MC's entire body
4. Sauna or bath house sound perfect
5. Idk maybe analingus
6. Holding on to his horns while pulling in for a dominating kiss, or, licking along the "gooch" line while staring into his eyes
7. Definitely Asterion doing more groping or guiding the MC's hands to where he wants them
8. Asterion seems to be fond of the MC natural musk (and vice versa)... that should definitely be remembered for the nsfw scenes