Consent to one thing (whatever that may be) does not imply consent to another thing. If you fail to make sure consent exists you always run the risk of doing something non-consensual. If that’s a risk you want to take, well, then do it. If you believe in your infallible abilities to read body language go for it. But don’t complain when others call you out for sexual assault or rape. (This doesn’t even begin to address the power imbalance of the relationship.)
You should re-think the tons of empathy you seem to have for this guy, based on some imaginary life-destroying effects of this blogpost, all the while you seem to have exactly zero empathy for her.
Think about that.