So we know TFA Beachcomber's kind of a bum. I imagine he's perpetually broke, too, and tries to pick up whatever jobs he can.
He tries to get accepted into medical trials, but it's not easy since he's usually on some substance or other. Thankfully, he's found one that will take him.
It's a trial for an experimental drug to kickstart a mech's reproductive coding, which has been dormant ever since the Allspark and Vector Sigma began bestowing life on Cybertronians.
Right after the procedure Beachcomber doesn't feel any different, but they paid him so he's pretty happy. He goes back home (he's convinced Swerve to let him stay with him) and things are normal for like a day.
Then he starts getting all hot and itchy and self-servicing isn't enough anymore. Beachcomber NEEDS a spike. Like, right now.
He corners Swerve after hours and all but begs to be dicked down, in a stark contrast to his usual laid-back nature, and rides him with an eagerness and enthusiasm (and stamina) Swerve has never seen before.