Now that Aster was completely inside of her asshole, he could feel the clear difference between doing it on the front and the back, Lilia's pussy was for sure tight but he was able to move without too much force thanks to the big amount of love juice that acted as lubrication, on the other hand it took a lot of work to just push it inside of Alice and his current size was not even close to the one he will reach in the future.
He stopped kissing Aria for a second.
"Sis I'm going to start moving… try to relax a bit or it might hurt you".
…
It took Alice a moment to answer.
"Yeshhh ♥", Aster was being as careful as possible and that allowed her to fully enjoy the orgasm that he made her reach when he pushed all his penis inside of her.
Aster started slowly moving his hips back and forth which made Alice tighten her hands on the sheet.
"Mmmph ♥"