(Requested by @GlamRockCrash)

Ratchet was in the med-bay, talking with a young femme named Lightning, who just started her first menstrual cycle. "It's perfectly normal, Lightning. Sometimes it'll hurt, sometimes it won't. You can rest, take some painkillers, use a heating blanket if it gets too bad." Ratchet explained.

"Uh, Ratchet, I have a question." Colonel William Lennox stated.

"What is it?" Ratchet asked.

"Can a human and Cybertrronian have sex with each other?" Will asked.

"Very much so, yes." Ratchet replied, after a small pause.

"Can we do it?" Lightning asked. Ratchet heated up, grumbling. Will decided it was time to take his leave, and he walked out of the medical bay. 

That night, Ironhide was reading a data pad, when Will just barged in his room. "Will?" He asked.

"Can you go into your holoform?" Will asked. Ironhide was confused, but he did as Will asked.

"Why do you want me in my holoform?" Ironhide asked.

"Look... I know we've been dating for about 4 and a half months.. I wanna have sex with you, 'Hide." Will stated.

"Really? With me? With an old man like myself?" Ironhide asked, surprised. 

"Yes, with you. I don't know another Ironhide, not to my knowledge." Will laughed. Ironhide pinned Will to the bed after that.

"Where can I touch you?" Will asked.

"Certain parts of my body open on their own, it just depends on how aroused I am. If you wanna see them open, and get me aroused, we could be here for days." Ironhide explained. After he said that, Ironhide started kissing Will's neck, undressing the man. When Will touched a really sweet spot that aroused his lover, his eyes widened, seeing Ironhide's spike.

"What... what is that? Is that your dick?" Will asked.

"We call it a spike. Despite us having human holoforms, we still have our spikes and valves." Ironhide replied. Will got cheeky, and started stroking the spike.

"Fuck... Will..." Ironhide groaned, it wasn't pain, but it was pleasure.

"What's the matter, 'Hide?~" Will asked, huskily.

"My spike.. is really sensitive." Ironhide panted. Within moments, Ironhide came all over Will's hand. He slid into Will with ease. 

"Let me know if I'm hurting you." Ironhide stated. As they moved in rhythm, in sync. After they both came, both men were panting.

"You got one more round left in ya, or are you tired?" Will asked, grinning.

"You kiddin'? You're about to be sore, Lennox. I'll make you scream my name. Now first..." Ironhide stated. He then bit Will's neck, marking him.

"Whose are you, Lennox? Whose?" Ironhide demanded.

"Yours. I'm yours, Ironhide. No one else's." Will stated. After their 2nd round, they decided enough was enough, and cuddled close together. After a bit, and after cleaning everything, including themselves, up, they put on a movie, and fell asleep in each other's arms.