I used to have a relationship with my older sister many years ago. We recently restarted it

My sister is older than me. When I was 18 and she was 25, me and her used to do stuff sexually together. It lasted about a year but then we stopped and moved on.

Since then she got married and started a family. I've had short term girlfriends but have mostly been single.

I am now 36 and she is 43. Recently we restarted our relationship. I feel kind of bad because she's going behind her husbands back, but ultimately I don't regret it. We both want it