Spoiler chapter 25

Was it their first kiss? After seeing it I was trying to look at previous chapters to see if they kissed while fucking, like in the heat of the moment type of thing.

Yes it was because Seo yechan was actually crying while screaming that Chani kisses everyone but him and asked why and if he, Chani, saw him as less than a human, more like a dildo and only wants him for his dick. He was very emotional and demanded that Chani see him as he really is.