Tracks is convinced by Beachcomber to go to some sort of hippie free-love festival (or whatever the Cybertronian equivalent of hippies are) at the shore of the Rust Sea. It's also kind of nudist (in that everyone is walking around without most of their plating).
At first, Tracks is absolutely scandalized by the sheer amount of public interfacing and all the mechs with their base protoform exposed. There's valves and energon pouches and spikes everywhere he looks.
But he also notices people paying attention to his own frame, and that stokes his vanity. Tracks loves to be the center of attention, even if his beautiful plating is gone for the moment.
Some bot at the festival is offering to do body paint or some similar detailing, and Tracks lets his base protoform and energon pouches be painted with elegant silver lines. In fact, he rather likes this new look... perhaps he could get used to this.
Other mechs reach out to trace the designs once they're dry, admiring Tracks' frame. The borderline worship is absolutely wonderful for Tracks, and he allows them to caress and lick his pouches.
There must be something in the air (or maybe that music they're playing), because Tracks eventually finds himself on his knees, being spiked by a total stranger. At least none of his so-called friends would be caught dead in a place like this, so he doesn't have to worry about them seeing.
Beachcomber is there too, muttering encouraging words and telling Tracks something like "see? It feels good to let go and enjoy the moment, right?" Tracks is absolutely lost in a haze of pleasure and sensation, from the soft touches of his admirers, to the hypnotic rhythm of the music, to the smell of interfacing, and the taste of gourmet oil.
As night comes on, he eventually gets drowsy and lays down to recharge, cuddled up with Beachcomber and the stranger's that he's been fragging with for the past few hours. It's one of the best sleeps Tracks has ever had, laying on the cool ground with the stars shining above.
Once he wakes up some of the shame comes creeping back in and he's very relieved to be able to put his armor back on and go home. After that, though, he starts feeling very weird — mopey, tired, but craving a good frag and unable to resist Beachcomber's spike.
He eventually realizes he's sparked up (with multiples, no less) once his belly starts swelling. Tracks hates it — how can he go out looking like this?! He barely fits in his own plating. Now he has to go around with his protoform (still painted from the festival) all exposed and his energon pouches hanging out.
Beachcomber takes care of him, massaging his belly when the sparklings inside squirm. To help their frames develop, they need a steady supply of transfluid, which Beachy is all too happy to donates. He has to admit that seeing Tracks so heavy and full of life like this is absolutely wonderful.