ok, I have to give it to the author, the cheating kiss in close proximity was a clever idea to make it believably seem fresh to the sexually experienced girl. the manga is still gradually. losing it's intensity though imo .
I think the author has to admit the inferiority of just-kissing and move on to other things.
Even in this chapter he was using his hands too. putting his hands on her face, her neck, her lower back,if you;re going to put your arms around a girl while kissing them, why wouldn't you reach and feel her ass? Why wouldn't you feel the heat of her pussy? or squeeze her tits?
It looked like Taira always set it up like she'd control what the boys hands were doing and the boy was either not allowed to touch the girl or only allowed to put their hands on the girl's shoulders.
If now he's kissing and letting his hands do what they want and feel the other girl's body then why wouldn't he start feeling up their tits and ass and pussy?