Futanari Musume wa Yarizakari - Vol. 1 Ch. 2 - Futanari in a Cafe Chapter 2 ~Don't Get Horny in the Conference Room, You Futanari~

[MangaDex]

 

[GreenDude1]

Damn the post nut clarity hit her hard.

 

[ArashiRen]

I believe that’s called a Devil Trigger