I don't know why I did this but okay
Sharing the bed was an initial adjustment that Harvey was not quite prepared for. Sure, he'd shared the bed with women before but it was rarely more than once, rarely anything particularly special because he was primarily just done with them when the sex was over. He understands that it's brash of him, but he wasn't one for intimacy. In fact, on more than one occasion Harvey would slip out of bed early because the heat from another body was just not what he signed up for.
Truth be told, the first time he rolled around in the sheets with Donna he was terrified that he'd discover he was the same way with her. Most of the time, she'd come out of the bathroom fully dressed and with a fresh face before she'd leave. Part of him wanted to see if it was different with her but the other part of him was relieved that whatever could be between them wouldn't be ruined so soon - he couldn't stand to lose Donna.
It hits him like a light when he realizes that he loves her. He doesn't know if it was just always there and he didn't notice or if it was one of those things that one day he suddenly just is in love with. He suspects it's more of the former than the latter, but his refusal to acknowledge for so many years made it difficult for him to see that he wasn't just fucking her but he was expressing his love to her.
He asks her to stay and to his surprise she does. She wears one of his t-shirts that's a bit too big on her but he thinks looks good anyway, but he absently wonders what doesn't look good on her. He watches her carefully as she slides in between his dark, silk sheets on the right side of the bed.
It's brought to his attention that he doesn't even know which side he usually sleeps on but he's happy to take the left. The left side of the bed is cold by now, cold enough that it cools his skin, but they're both snug fairly close to the middle anyway. He's never really been the type to welcome the heat of someone else, especially while he sleeps, but her warmth feels different somehow.
He rolls onto his stomach, sliding his hands beneath pillow, and he faces her. He tilts his chin downward to look at her, the faintest of smiles on his face as he appreciates how perfect she looks with her flaming red hair dispersed over the pillow and lips etched into a slight pout when she rolls over onto her side to face him. He's pretty sure this won't last long, this sleeping arrangement, because neither of them have seemed too eager to share the bed.
He forgets his suspicions when she cups his cheek with her hand and places a gentle yet nurturing kiss against his lips. Her fingers slide into his hair and moves down to in between his shoulder blades. Her hand there is a comfort that he didn't know he wanted.
He pulls his right leg up and slips it between her thighs, so when he wakes up, he can roll over and look at her without waking her up.
He doesn't know now that this is a position they will repeat for years to come - a precedent to their life together.