Good news!!! His blood tests came back negative and he was already making all the staff love him before I walked out the door. The shelter is Friends of
Cats and she said they normally don't take strays and don't really have room now, but when she opened my email all the staff ended up gathering around to look at his picture, so they decided to break the rules a bit and take him. My roomate started calling him Cassanova yesterday and they decided they'd keep it (seems to fit). They think he's about 3. They'll vaccinate him, neuter him, and she doesn't think it will be an issue to find him a good home. They're a no kill and have a few different rooms for the cats to roam around in with both indoor and outdoor access so he'll be much more comfortable than being locked in my bathroom while he waits for his forever home!