@Essen Even Jiho knows it. She told herself how trashy her behaviour is for fooling around with both girls but at the same time.. I can't be too mad at Jiho. She is entertaining Yeonwoo sunbae right now with the intention of becoming an item with her in the future. She is someone Jiho likes or has a crush on for a long time. She is still unaware how deep her attraction is to Woohui. She even says to Woohui that if things become serious with her and Yeonwoo then there won't be any touchy stuff between them anymore. Jiho never had an intention of doing touchy stuff with Woohui at the beginning. As we can see from ch1, when she starts to get fixated on Woohui's chest, she could not look at her and she starts avoiding her. Then when Woohui allows Jiho to make a feel and go for it. It becomes a habit. It's a weird dynamic but in Jiho's mind, Woohui is only doing that to cheer her up. (Still something so weird that is impossible to picture in any real life situation but I'll take this reasoning for the sake of the story.) Again, Jiho's attraction is so obvious when she could not again look at Woohui when she dress up for her date. She's having a hard time looking at her face and when Woohui ask her this.. Jiho was asleep but later we can see Jiho blushing so much. Describing Woohui as pretty and not cute.. Yeonwoo sunbae is having all the fun in teasing both Woohui and Jiho because she knows. While the two are having a hard time figuring themselves out.

@A77y If we're talking about Woohui's lips.. not yet. Because she got punched right before she could.  But she definitely kissed her other parts already. And each time something's about to happen,Woohui always ask why Jiho is avoiding looking at her.