He huffs, souring at the idea of what Chie was going to say when she found out.

"Yeah, I can hear it now." And in his best imitation of Chie's voice, he starts to mock her:

"Yosuke, I can't believe you you stinking perv! You always freaked out and now you're dating Narukami???? Eeeeeehhhhhhhh!" He sighs, not wanting to think on it much.