Whatsapp Videos

My friend has recently asked his partner to marry him
I think she loves him and feels secure...but not excited

Ive known her for years
A while ago we started chatting on whatsapp about sex and our turn ons etc.

We have now reached a stage where send each other some pretty graphic pics.... and then send videos of ourselves wanking and cumming over them.....
I know we both feel massively guilty.... But finding it hard to stop