Soundwave, as it turned out, loved interfacing. He spiked Cascade repeatedly in the berth in several different positions, which often ended with her on top. Even when they made it to the washracks, she ended up pinned between the wall and his frame, thrusting into her.
They didn't sparkmerge nearly as often as they interfaced; their frames usually too tired to transform any parts at all. Neither of them had felt so strutless before and Soundwave had to force himself to get up to prepare two of his biggest cubes of energon several times to keep them from collapsing. With enough sweetener for her to enjoy.
Currently, he was lounging back against the pillows, lazily sipping energon with Cascade stretched out between his legs, her head resting on the edge of his open dock. He'd taken to keeping the glass off and set aside. It wasn't made to split and open for sparkmerging.
He rubbed her back between her wings, offering his cube to her lips. She smiled, her optics still off as she sipped some of the energon. He smiled and kissed the top of her head.
She pushed his arm away when she had enough and yawned widely, lightly nuzzling against his dock. "Mmm, it'd be a miracle and a half if I'm not sparked by now."
He smiled softly, gently rubbing her hip. "Cascade; content?"
She smiled up at him, lightly tracing along his open dock. "Soundie, if we interfaced again, I think you'd knock me into a reboot... again."
He chuckled softly, finishing off the cube. They had one round where he'd spent well over an hour licking at her valve and spike. Even after he'd swallowed her transfluid, he'd taken the time to lick and tease her sensitive spike sheath. He was rewarded with her vocalizer shorting out and her falling into a harsh reboot. The reboot had shocked him into stopping and examining her. She woken up quickly enough and he'd easily repaired her poor vocalizer.
She onlined her optics and reached up to cup his cheek, lightly tracing the tip of her digit against his lips. He smiled softly and she slowly traced along the scars, leaning up to kiss his cheek. "I love you."
He gently squeezed her hip, offlining his optics. "I love you."