In college I dated a well endowed guy that unfortunately had some issues in the bedroom... a waste of such a nice cock. I was really adventurous at this time and wanted to try a bunch of things with him. We did try out a few things but for the most part we had very vanilla, very quick to the trigger sex, and then he would be embarrassed and wouldn't take care of me. It was quite frustrating. (but I'll be honest I also kinda got off on being able to make him cum so easily. I would ride him and he'd try to stop me right away and I'd go really hard and make him explode in less than a minute. even though it was disappointing, it gave me a thrill)

Anyway, one day we were hanging out at my house (I still lived at home at this time) and we had sex. when we were done I told him I wanted to show him how I make myself cum in the shower. He seemed into the idea and agreed

We get into the shower and I start kissing him. I have to be quiet because some of my family is home, but not too quiet cuz they are on the other side of the house. I press my naked body against him and feel him get hard. but instead of touching him, I grab the shower head.

I tell him to stand there and watch me. In hindsight I wish I had involved him more but he never really took the initiative. Would have been great if he caressed my breasts or fingered me while I played but oh well. I take the shower head and change the settings so the water comes out hard and fast. I bring it to my pussy, allowing the water to press hard against my clit. I put one leg up on the facet so I could hit every spot. It didn't take me long to reach orgasm. I forgot he was even there tbh. I was pressed against the cold shower wall, my body totally exposed, my head back and eyes closed. I start to cum and moan, louder than I should have been honestly. I had never gotten off from masturbating in front of anyone before. It was so exciting and I was sooo into it. I came so hard.

I open my eyes and I'll never forget the look in his eyes. He looked completely panicked and terrified. Maybe threatened by the shower head? Maybe realizing he had definitely never seen me cum again. Maybe thinking he'd never be able to make me feel that good? I was expecting to see him looking at me with wanting and lust, but instead he was petrified, frozen. I tried to be sweet and sexy, lean in a kiss him and tell him how fun it was. He was still semi hard but obviously not into it. he kissed me back but was ready to get out of the shower. We dry off and get dressed and never talked about it again.

For years I couldn't masturbate in front of anyone, especially with a toy (which is really the only way I cum). I never really put it together that this experience might have caused me to feel shame around it and I'm still deprogramming some of that shame to this day.