The idea is that another vampire (William Moseley maybe?) was a noble who used to heckle Demyan when he was human back in 1550s Russia. The noble got bitten a few years about Demyan, and now he's in New York. Demyan's grown into his looks, is talented, and very much a more sexual being now. I think it would be interesting to pit them together now and have them hate someone another (Demyan for past offenses, the other for Demyan having grown up from the serf shrimp he was) but be attracted.