Yeah, it's pretty clear that a lot of the sex in this work (and in the previous work) is het sex but with two girls. (Lesbians doing it doggy-style without a strap-on? wat?) And normally I'd be all eye-rolly at that.
But these two are just so charming and cute and lovey-dovey that I'm okay with the sex not really making a ton of physical sense.
I think it is pretty understandable with these two. They probably just search yuri hentai on the internet and follow through. Despite being inhumanly lustful (not a bad thing in this case btw), they seem like they only know how to masturbate (for Kaya she didn't even consider it until the incident). That's one more comfortable way to think of it, rather than because artist doesn't know much about lespies' sex.
This is just cute. The more docile moments just feel super heart-warming, likely because they are surrounded by crazy water splurting. That time when Kaya ask for a hug after sex, I never thought water slatter porn like this can be that damn cute.
Nice.