The ending scene of chapter 167 of the Chainsaw Man manga.
The scene involves Yoru (Chainsaw Man) grabbing Denji (Chainsaw Man) by the balls in an attempt to cut his penis off, but then they start making out while she gives him a Handjob, causing Denji to ejaculate in her hand right before Mitaka Asa takes back control of the body she shares with Yoru.