You're in the Armed Detective Agency with Dazai and get to know each other better. He seems very interested in you and approaches you, both physically and mentally. You feel like he's pretty proud of being with you.
On one particular evening you both stayed at work very late, you were there until the evening when everyone had already left. You complained about how incredibly tired you were and how you could fall over on the spot, you over dramatized it a bit. He chuckled and led you to the couch, letting you lay down there. He watched you for a while before deciding to lay down next to you. Admittedly, Dazai was really very comfortable. You snuggled up to him and lay half on top of him already. He caressed your hair, looking at your body as you lay almost on top of him and whispered softly. "Don't get too comfortable, love. We don't want us to stay overnight at work, right?" His fingertips trailed soft patterns along your shoulder and arm. You just chuckled and almost fell asleep despite his annotation. "If you fall asleep here I will bring you to my place", he suggested playfully, his arms now on your waist, squeezing teasingly.
"What will we do at your place?", you asked and looked up at him now, trying to suppress a smirk.
"We could find out~", his tone was now very seductively and his knee pressed ever so slightly between your legs.