It's my unbirthday. [Technically not a lie. Definitely not an answer to what Tim's actually asking.] I don't celebrate my actual birthday anymore.
[He would just lie and say he doesn't have one, but then Tim would try and give him a birthday like Ren. That's more trouble than it's worth, because he'd probably end up picking his actual birthday so he could remember it. This way, he might not have to give up the specific day and that's what he cares about.
If nobody knows the specific day, then he can pretend like anything people happen to end up doing actually has nothing to do with his birthday.]
no subject
[He would just lie and say he doesn't have one, but then Tim would try and give him a birthday like Ren. That's more trouble than it's worth, because he'd probably end up picking his actual birthday so he could remember it. This way, he might not have to give up the specific day and that's what he cares about.
If nobody knows the specific day, then he can pretend like anything people happen to end up doing actually has nothing to do with his birthday.]