He catches the message just before leaving for home, and then has to read it a couple of times, with complicated (and turned on) feelings throughout. He tries composing a response, gives up halfway through, and bikes home, still thinking it through. There's some extremely hot parts (it's mostly hot parts) about sucking him off under the desk. And being his desk toy (which is extremely hot phrasing and he's glad that on the bike his hands have more important places to be). (The imagery and... associated fantasies swirling in his mind about that are so hot, he suspects she would get bored but telling her to kneel and wait to be used is so fucking hot, the idea of her being there for his pleasure is so fucking hot, the idea that she's not something/someone he needs to worry about looking at indiscrete things with...)
It's that last one that's causing him problems. The idea is so, spectacularly hot, but it's also almost terrifying. She's indicated that she doesn't mind (and even tried to get him to do it before with the story) but he still feels unsettled about the idea. Maybe if it's something they set out to do explicitly it would work? He wants to do it, but the idea of doing it, looking at things that he doesn't feel like he should be with someone else around... the idea of it makes him feel weird. And wrong. But it should be hot and he wants to do it? (It's so hot.) So he wants to try it.
Eventually, he gets home, and actually writes her a message.
I would very, very, much enjoy that, as celebration, or as accompaniment. All of it sounds very hot. As does you calling yourself my desk toy. I really like the concepts behind that.
Should he relate some of them? She doesn't seem to have a problem with it, he's just terrified he's going to do something wrong and not be there to catch it on her face. But nothing has gone wrong yet? He'll try a more tame one.
I really like the way it leads into the fantasy of you being there, kneeling and waiting, ready to be asked to serve whenever the mood strikes me. I don't think it's a good idea to do for real, you'd probably get bored really quickly if I don't actually do anything for a while, but I thought I'd share that.
Regardless, I am now extra looking forward to tomorrow afternoon. I should go finish my essay, but if you want a distraction or two my way, I won't mind. :D
He dithers a bit about the last sentence, but leaves it in. They can always stop texting sexy things at each other if it gets too distracting (right?). And then he sends it, and goes inside to get to work.