Lee moaned as he simultaneously thrust his cocks into two waiting pussies. He looked over to make eye contact with himself, and groaned at the sight of himselves fucking the women underneath him.
He'd had sex with both bodies at the same time before, of course, but this was the first time he'd found women - sisters, in fact - willing to do both of him on one bed.
He thrust in as far as he could, pleased to note that it was roughly equally far with both women. Symmetry helped, he had found. He then drew both slowly out before slamming them back in in synchrony. He smiled as the sisters moaned in rhythm and harmony. He kept at it for a while, gradually increasing his pace, until both sisters were near orgasm. Then he had to concentrate, carefully keeping the rhythm matched but using different stroke lengths in the two different bodies to bring the two sisters to orgasm at as nearly the same time as possible.
After their first orgasm, he decided to switch from symmetry to antisymmetry. He made his in-strokes take as long as his out-strokes, and kept his two bodies perfectly out of sync, like the pistons of an engine. The women then moaned alternatingly, "Lee!" "Grant!" "Lee!" "Grant!"
He couldn't explain that his two bodies were really just one person, so he'd named one of them Grant and told people he was identical twins. He had no good way of distinguishing his bodies, though, and was sure the appellations had switched quite a few times (and he'd made an embarrassing error once or twice when he seemed others to forget his own name). Things were certainly complicated, but he got along alright. If you'd asked him he would've said his biggest complaint about the scenario is that when he met people they frequently commented on his parents' bad sense of humor (regarding his names), which hurt since in fact it was his own bad sense of humor.
But, back to the task at hand. He sped up, and felt himselves nearing orgasm. He switched back to synchrony just in time for one deep plunge to the hilt as he had his first and second orgasms while the girls had their second. He leaned down to kiss the sisters, and then leaned over to kiss himself. He'd definitely have to try sisters again.