"I will until I have too many myself. Then we're both in trouble," he half teased, squeezing her shoulder. He was still having some internal debates about how long he wanted to stay, how much he wanted to drink, if he wanted to find someone to spend the night with.
Logically he knew Lily didn't really need a babysitter, but he was having trouble convincing the more illogical parts of him. If James were here, it would be easier.
"How many is too many, again? One? Two?" He asked, slipping into a more genuinely teasing tone, fighting off a grin. Sirius tilted his head to glance down at her for a brief moment before shifting his eyes forward once more to watch where they were going.