It's definitely something that's theirs, something Spike seems unlikely to get into (even if he'll always enjoy the after-effects) and there is something nice about that. There's also something really nice about feeling that he's been able to help Ianto begin to overcome what Tyki did to him, start to wash away the shadow of that horrific night.
He grins at Ianto's request and presses a kiss to his forehead before starting to wriggle out from under him. "Of course." He knew what was planned ahead of time this time; he's got everything he needs to hand. There's water and pills on the night stand, and salve in the drawer, and he grabs them all and presses the bottle of water into Ianto's hand so he can start to rehydrate while he shakes out a couple of painkillers and offers them too.