He's not expecting that, so when he collides with Reno, his first instinct is to just hold on so neither of them fall. He relaxes after a second though, his fingers curling into the back of the other man's shirt and his face against Reno's shoulder.

"Alright." He would, when they got back to his building. He'd invite Reno up just to stay the night in the most innocent capacity he could manage.