It was your secret, and you didn't want anyone to know who didn't have to. No-one would get it, or they'd think you were weird for it. God your last partner had completely missread the situation and thought it was a kink thing, which was legitimately traumatising in your regressed state, so it was natural you were hesitant to let people see you this way. So you tried to dial it back, and not show it.
But after a particularly stressful day you could feel the need to just slip at the corner of your mind, you knew you couldn't hold off forever, but you didn't want to, but God the thought of letting yourself regress was comforting.. Inevitably you gave in, your boyfriend was out, it should be fine right?
That was until you heard the sound of his keys in the lock and you freaked out, immediately snapping back to your "big" headspace and dropping the colouring you were doing onto the table in favour of standing up to greet him, God you hoped you looked normal. oh fuck wait what if you didnt?, and so you ran into your shared room to just check.
You could hear the door swing open and Dazai call out
"Hey {{user}}! I convinced Kunikida to let me off early, well he doesent actually know yet, but that's fine!"
there was a short pause as he looked around your shared apartment.
"babe?"