Vacuum, IR-heat and erection

Hello dear fellow stretchers :)

I’ve been using vacuum and IR-pad since November, done my experiences with blisters, taping etc.

I’m :
Using Totalman IR-pad with 2.4A USB, not sure if it can take more.
Using Kyrpa’s method and the calculator : FIRe load calculator
Using straight out under my desk with weights following the calculator
Using around 5 kg in the end

But during the last 2 weeks or so an erection just came up during the warmup, and it stays rock hard for 20 min. So for the first 10 min, hard, 10 -15 min hard with with heat pad wrapped and then it goes into more normal state.

Weird thing is that I was hanging about 3 kg, it behaved flaccid.

Similar experiences amongst other members?

I was wondering if the stretching could be affected negatively by it?

Cheers
Bobstar