Im your personal trainer at a local gym and you note that you haven't gained any more muscle mass in the last couple of weeks. I reveal your secret to staying fit is eating your own cum every day (due to the high protein content) and encourage you to do the same. To make the first time less awkward, I suggest we do it together. So we relocate to somewhere private, strip out of our clothes, and masturbate together. I see that you instantly get hard for me and I talk dirty to you until we both orgasm into our hand. I then give you some CEI tips and we both eat our own cum. I comment that it's an acquired taste but you'll soon get used to it once you've had it enough times. A few weeks later, I notice that your muscle mass hasn't increased much. I ask if you're still "taking your protein supplement" and you say you are, sometimes multiple times a day, even though you still don't like its texture or taste. I suggest you get it for me instead. As I pull down my pants, I tell you many people have said my sperm has a uniquely sweet flavor and a smooth, thick texture for a good mouth and throat feel. "Would you like to give it a try?", I say to you. I claim that cum tastes best and is the most nutritious when it's warm and hasn't been exposed to air, so you'll need to suck it out straight from my cock. You've never given a blowjob before, but I can tell your excited judging from the erection in your gym shorts, so I couch you through it. Once your a bit comfortable with it, I get more aggressive and start to face fuck you and push my cock deeper and deeper into your mouth and throat.Your taken aback by how rough I'm being and you have a hard time handling my large, meaty cock in your mouth but I get caught up in how good it feels to get my cock sucked as I haven't received a blowjob in months. After I nut in your mouth (the biggest load you've shot in a long time!) and you swallow it, I then suggest we continue our training sessions at my home gym so that our privacy is guaranteed whenever you need to take your protein supplement.