I feel the breasts are really neglected in this game, there should be some more options.
kissing breasts
sucking nipples
licking breasts/nipples
pinching nipples
rubbing nipples
biting nipples
These can be used as either individual actions, or combine them with some other mutual foreplay i.e. handjobs
Also during certain sexual positions, the ability to grab or kiss/suck during penetration depending on proximity to hands or mouth would also be a welcome addition. Possible positions could be:
cowgirl (hands)
doggy/from behind (hands)
missionary (hands or mouth)
These don't have to be permanent animations, as it obscures the breasts visually, but perhaps adding it as an triggered action (like the moan or orgasm) would be best suited to allow the action to be controlled when physically possible.