I fell like this is a bottom sanji safe place so here it goes.
Sanji completely drained and overwhelmed after sex, gives space for cute "oh darling I will take care of you" moments but consider the funnier option of sanji ,being the little freak that he is, being completely fine and refreshed the next day while his partners look like they have been completely drained (they are very happy about it, but very tired)
Shanks seducing him and Sanji is all bushy and nervous shuttering a bit it's adorable, then he gets him in the bedroom and spends half the time in bliss the other half cursing his lack of stamina. Starts a new training regiment the next day.
Luffy and Zoro dragging into the bedroom and people going. "Oh he's not going to be able to walk tomorrow" But next day Sanji radiant, making and extra big breakfast and Luffy and Zoro are so tired they sleep through breakfast (Luffy! Missing breakfast)
Sanji having a romp with Crocodile the day before a meeting and the warlord is shaking so much the next day he ends up signing whatever Nami wants.
Ace is a very thankful puddle of goo by the end of it and overwhelmingly happy about it.
And because I loved the Sanji and the kid pirates prompts. Kid and Killer entering the room thinking "wonder if he can handle us" emerge from the room the next day chest so sore they can't wear shirts for a week. (Truly an enlightening experience)
Even if they can't really keep up they all love it, some call it a religious experience.
(Bonus for stepfather whitebeard: when he was a kid and Newgate came to visit him and the old man wold lock themselves in their room, and sanji was sent to go out with his brother's and only come back when they got a denden call, it was never less than 20 h so in Sanji's mind "only" going all night is showing restraint. Marco and Izo curse them both when they hear about it.)
This is absolutely a bottom Sanji safe space. But I'd like to counter Marco and Izou cursing them with just most of the fleet being like this and Marco and Izou have their own strings of regular hook ups they call that end up like all of Sanji's boyfriends. They totally don't mind taking the kid for a weekend away, the other staff is definitely mad that they cannot escape like Sanji can.
Shanks's first time with Sanji he thinks it's a fluke. It's an adorable sight , the blush and stuttering from the younger one. He doesn't expect their first night to be half spent in pure bliss and the other half him cursing the stamina of his partner. The second, he's eighteen! Makes sense he's got a smaller recovery window. Third time Hongo tells him it's a pattern. Shanks starts training so he can keep up. Sure he can keep up better the next time and he's getting healthier than ever when his crew offer suggestions to keep up like cutting back on the sake and shit. Mihawk is blinking at his friend who is explaining this and the elder mutters something about family traits despite no blood. Shanks is probably sober by the end of Wano and is in peak shape and still can't keep up with the way Sanji rides him. It's a losing battle. One Shanks doesn't mind losing because he has other ways to keep Sanji occupied.
Sanji being pulled away by the captain and first mate for a night of fun and the crew bets on the marks Sanji leaves on his boyfriends and his ability to walk in the morning. Lo and behold the next morning Sanji is dancing around the galley as he does every morning and as plates are served Luffy and Zoro are nowhere to be found. It's nearing lunch when Nami asks Sanji about his partners being okay which he assures they are. They are just very tired and very sore. Nami watches him take plates to the quarters before going back and whispering in horror that Sanji might be an actual succubus. Robin wonders if they'd be willing to let her study what the fuck is going on with their cook and his stamina.
Sanji having a night with Crocodile to get an upper hand for the crew is easy. It was fun, Crocodile thought he would be in charge but quickly learned that was not the case. The logia is shaking and half melting into sand that he just gives the Strawhats whatever they want. Buggy and Mihawk are snickering the entire time.
Kid and Killer not realizing what they got themselves into until they cannot put shirts from the scratch marks, bites, and hickies. It takes a week before they can have anything rubbing against the wounds the cook left. They both agree it was the best sex of their lives. Totally would do it again.
Ace being the lone outlier of the fleet having wild stamina is so funny to me, cuz he would be the happiest puddle of goo under Sanji. He would like to stay here forever like he's a toy and when he gets back to the fleet Marco and Izou are losing when they tell their captain Ace couldn't keep up with Sanji. That's when Ace finds out why Marco would be unreachable for two to three days when he was visiting his "friends" and why Izou basically had an on-call harem on a few different islands. White Beard says he and his husband are a perfect match in more ways than one and now Ace is pissed off he can't fucking keep up with a bunch of old people.
I feel like the last three are in the slut!Sanji universe and they all call their interactions a religious experience. If someone asks Croc, Ace, kid and Killer all day to take the chance. You'll either switch gods or pray to the Hat's Cook and his legs. Shanks's crew thinks he landed a god of lust or something and Shanks doesn't argue, just says he prays as often as he can with goofy smirk as his crew groan and call him a pervert while he laughs. Luffy and Zoro don't pray, but they plan, and the plans never work because Sanji is too pretty for their safety and it constantly bites them in the ass.