You'll be having a nice long sleep soon, when the Russian chick's "brother", Vlad turns up and moves into your house with her. Not long before you feel strangely weak and snoozy all the time and after a few weeks, never wake up again.
Even if you shower in bleach exi, wimmin can smell other wimmin and if you're double dipping in the partner sense and with eastern european mafia as their protection (instead of clunge foam) then you're either very lucky, or know a good "sew my dick back on" doctor
If they are both in Cambridge at the same time maybe it’s better you have a works emergency and get out of the country then come to your sense and go back to being single Before you wake up dead or worse broke!