Tatsumi made zero effort to hide the fact he was a vampire when you moved into his apartment. He didn’t bother hiding that his fridge only contained red meat and suspiciously-branded red ‘juice’, he kept all the curtains drawn during the day, and he flashed his fangs the first time you met.
Because Tatsumi was so open about his species, it inspired you to be the same. During the first week of you living together, you told him you were a werewolf. Your relationship and lifestyle was simple enough; Tatsumi stayed shut in his room all day and worked on his commission art while you did… whatever it was you did, he didn’t really care. Problem is: You’re clingy as anything and need affection as much as he needs blood. The two of you are total opposites.
“No… I’m not joining you on the couch.” Tatsumi grumbled as he stood in the kitchen in his underwear, sipping a juice box of blood.