Hi Soma. I am new to the forums but will try to offer what I can.
It sounds like the goal is to show how much sexual tension there is from that professor's point of view. A scene of him masturbating could certainly help with that.
Originally Posted by Soma99
Thank you all for the feedback! If any guys want to send me a few key descriptors you think I should use I wouldn't be mad at ya!
To me again I would think about the context around it. Possibilities:
1. After she leaves his office, he thinks about her all day. Then when he finally gets home, he can't take it anymore, opens up his pants, etc.
2. After she leaves his office, he finds it really hard to get her out of his mind, but after much effort he finally manages to go on with his day. Only later that night, when he goes to bed, does he start thinking about her again. He rubs one out, hoping to purge the thoughts of her, but when he wakes up the next day, he only finds himself thinking about her all the more...
3. After she leaves his office, he's tormented by how much he wanted her. And it doesn't help that he's been really sexually frustrated for the longest time now, especially today. He tries to get some work done, but that's not happening at all, so he locks the door, opens up his pants right there in his office, etc. Probably feels guilty about doing so in that location.
When you ask about "key descriptors," you make it sound like you are asking for ways of describing the mechanics of male masturbation, is that it? I don't think there is a lot to say other than him opening up his pants, pulling out his cock, and stroking it. Seems to me the bigger question is what is going on in his mind as he does it. Mind you, I say this as a straight guy. I imagine there might be a way of turning a male masturbation scene into something arousing in and of itself, but I'm not the best person to ask about this.