Responses
Dom as per usual. Might have been just him doing the usual. Coz remember he said from the first chapter that he had 3 subs. Maybe a last session? Don't wanna google lens the chapter and wanted to wait on the fan translations. Uh, spoiler if you haven't read this type of trope...
At least they respected each other enough that Masa even told the sub he's a switch. He'd already found out by then from his doctor that he was a switch. The only reason why I know is coz the word SWITCH was in English.

Spoiler
Confused now coz from what I understand they're not going steady as one panel suggested with the line 'they're going out properly now.' Masa is still shown post dom/sub session with another guy. (nothing explicit). It's shown in chapter 3. Very amicable talk and then parted ways without drama.