Zutto Suki Datta Kyonyuu Osananajimi ga Furyou-tachi ni Moteasobareta Nanokakan

Koki is getting bullied. The girl he likes finds out and, in order to save him, decides to take things into her own hands. "Things" meaning "dicks" in this case.
(Source: Irodori Comics)
Note: Released at Comic Market 102, 103, Fanza (2024/10/14)