(Please see all previous disclaimers)
Grimlock continued for a bit longer before he stopped and withdrew, earning a whine from Lancex. Grimlock whispered into Lancex's audio and gave the bot an instruction. Soon enough, The berth had been lowered and Lancex was on all fours. "Why watch? Why no join?" Grimlock barked to Optimus and Cosmos. Cosmos wasn't sure, but followed Optimus' lead as the bot headed right for Lancex's legs and groin. Grimlock smiled, happy to,share now that he knew that they weren't going to stop him.
Optimus and Cosmos found a position where both could reach the port and both slid in together. It took all Lancex had not to bite the big thick spike in his mouth as he felt the two spikes in his port. Grimlock liked the tightness an didn't even notice thankfully. Optimus was a gentle lover and kept a much more gentle but fulfilling pace, which both Lancex and especially Cosmos appreciated. Cosmos wouldn't have been able to keep up had Optimus set a much faster pace. Cosmos realized that unlike Grimlock, Optimus always seemed to be aware of his mates and lovers and did what he could to make sure they enjoyed it as much as they did.
Cosmos smiled when he realized why they needed both Grimlock and Optimus as mates. While Grimlock were very protective and fiercely guarded what was his, he was brash and primative much of the time and didn't always think of other bots. Optimus, on the other hand, while he could be protective and such, he knew how to show love and care to those who mattered to him. It showed in how he was making sure Cosmos and Lancex both enjoyed this session. It made sense that one balanced out the other.
Soon enough, all four were heading towards overload. Lancex could only enjoy the pleasure as it coursed through him as he vocal box had shorted out in all the intense pleasure he was receiving. Optimus also rubbed Cosmos aft as they pleasured Lancex to make sure that the minibot would reach overload soon, as Optimsu could sense he and the other two were ready to overload soon and feared Cosmos may not reach it as fast if not helped with his own bit of pleasure. And once that happened, all three hit overload, with Grimlock shooting down Lancex's gullet, Optimus and Cosmos unloadimg in Lancex's port, and Lancex spilling onto the berth beneath them. They soon crashed into a heap, each breathing heave for the pleasure.