Source: https://www.pixiv.net/en/artworks/116368568
Artist's Twitter: https://twitter.com/CherryInTheSun
Artist's Patreon: https://www.patreon.com/CherryInTheSun
Finished

The artstyle is pretty amazing, and I liked how warm it was. But I am not sure if I understood correctly. I thought Aerith was pretending to be penetrating Tifa with a Penis while using her hands instead, but the last comment from Tifa made me doubt. Is it supposed to be a joke? Or I just read a futa manga without noticing?

Base +10

I've always thought frottage was exclusively male-on-male, none of that here, tag seems to be wrong

Base +8, Romi the Byzantine -8

@Manzor Aerith is just fingering Tifa doggy style, no deception intended, but Tifa mistakes Aerith's fingers for a penis because she's a total virgin.

@OtherUther By the strict definition of the word, Frottage can refer to both Frotting (which is male-on-male) and Tribadism (which is female-on-female), which is why I think it was mistakenly tagged with frottage. I will note that I believe the way the tag is actually used is more about the genitals then gender though with frottage being penis-on-penis and tribidism being vagina-on-vagina

Base +6