Ironically Coincidentally, we both have herpes.
I think irony would be if she didn't have herpes.
Well... I think Sasha had it right if we just look at that one post:
...
My sister is worse than me. She shoots heroin ..., ... prostitutes for cash when she needs it... I however just drink and dabble in coke, am kind of a bitch all the time, unemployed, don't prostitute, and I go to school full time. Ironically, we both have herpes.
This post (taken alone) sets Sasha up as the non-promiscuous, non-needle-sharing, "good" sister. The irony, then, is that despite her abstinence from herpetic activities, the herp has nevertheless managed to become a part of
both of their lives.
Now those of us who have been posting at L-G know the real truth behind matters so I'd suggest the following:
Ironically Coincidentally Unsurprisingly, we both have herpes.