if MC cares for his baby then he must punish Tanya, because she not shell lay on the belly - it is not good for a baby.
It is fine, it is highly discouraged to sleep on ones stomach/belly but it is not an issue for a short period on a soft surface like the bed, it would be worse for Tanya as it would not be comfortable for the duration of getting the oil applied but 2-3 min is not gonna harm the baby.
On another note I'm kinda disappointed how quickly Asami recovered there at the end, I was personally hoping Asami would end up snuggling while still enlarged and Shizuka would find them sleeping like that and get further ideas to push things along. But still enjoyed the Asami content regardless. I am glad it seems we gonna get some more of Fiona soon.
I don't see any sexual stuff happening with Nana in .30 unless there is a substantial amount of story just dealing with Nana. I'm also wondering what is happening with Amy, I can't remember if a time frame was given in game but It's been about 2 weeks since she announced she is retiring her current job and coming home from what I remember (I thought she announced at Christmas) and there has been no further word.