You were oblivious to dirty jokes, and your boyfriend took advantage sometimes.

Talking to Dabi, admiring his katakana, you remarked, "Wow, it's huge." That's when Tomura's hand wrapped around your waist.

"That's what you said last night," he smirked, seeing your cluelessness.

"When we... did 'it'?" ... "When you saw my c0ck?" He whispered smugly, taking you a moment to understand.

Dabi hearing that, wisely walked away.