After Wheeljack rages at him, and he hears (Y/N) crying; Magnus plans a last-minute short trip to apologize to (Y/N). The night has an unplanned event.
Warning: sexual content

"You do not know how to treat a sparkmate!" Wheeljack rages, "(Y/N) deserves better than you!"
Ultra Magnus felt he deserved this rather than scold Wheeljack for yelling at the second in command. However, Optimus scolds Wheeljack. The two watch Wheeljack walk away, angry. As Optimus explains Valentine's day, Magnus sees the rest of the team — even grouchy Ratchet — are pissed at him. They want to rage out just like Wheeljack did, but keep quiet.
After his lesson, Magnus goes to (Y/N)'s room. Before he can knock or say anything, he hears her crying.

"I should have known it was too good to be true, that he was just using me to not seem so strict. No one loves me."
I should have listened to Optimus. Magnus regrets and talks to Prime, hoping he has answers other than it's too late.

The next day, as (Y/N) sits on her bed, debating on leaving for good, Optimus comes in and tells her to get ready for a trip. She is confused, but that confusion turns into anger when Optimus says it's Magnus taking her on a trip, but she knows better than to argue with Optimus. She shouldn't argue with Magnus, but will gladly when she has the chance. Optimus insists (Y/N) gives Magnus a chance.

Ultra Magnus is waiting, already transformed. He knows (Y/N) is not pleased to see him, and this trip could turn into arguing, but he hopes this will show her how much he loves her.

(Y/N) steps out of Magnus' alt mode, seeing the ocean in front of her.
We're at the beach. She thinks as she looks around.
Right behind her, she sees Magnus' holoform in a military uniform.
"Come," he instructs as he takes her hand.
He takes her to the deck of a beach house, where dinner has been prepared. (Y/N) sees the sun is setting as she sits at the table. She watches the sky as Magnus tries to apologize.

"I'm sorry, (Y/N), I shouldn't have said my mission is more important. I didn't even know it was Valentine's day. Now I realize Miko was trying to tell me with hints," Ultra Magnus knows (Y/N) is ignoring him. He takes her hand from across the table, "I love you so much. I-I have been worried since I'm still learning about human culture, how I wouldn't be enough for you."
With how (Y/N) has been treated, she's not sure if she should forgive Magnus. She knows giving him the cold shoulder isn't helping the problem. Ultra Magnus watches years roll down her face. He picks her up, carrying her bridal style into the beach house, up to the bedroom.

Ultra Magnus isn't sure what to say. The strict commander can't believe what he's thinking.
I know on Cybertron, this is a way to promise we'll be together forever, but is it right with (Y/N)?
He holds (Y/N) close as he debates on his next move.
"(Y/N), I don't know how else to show you I love you besides a way we do it on Cybertron,"
(Y/N) looks at Magnus, uncertain what he's going to say, "it's... what humans call sex. We call it fragging."
They both nervously tell the other they never did it before, but (Y/N) is willing to because she loves Magnus. She starts at his six-pack once he takes his shirt off. The kiss turns into a heated make-out session. (Y/N) feels herself getting wet, thinking she's going to be doing it. Neither of them thinks about how there are no condoms as they take each other's clothes off. Magnus sees it as like how cybertronians do it; go right in the femme, but he's not prepared to see his girl in pain.
"It's fine," she smiles.
(Y/N) can't believe she's feeling Magnus' spike in her.
"I want you to be mine forever."
He kisses her as he moves slowly. (Y/N) begs him to go faster once the kiss ends. He can tell her moaning is good as he goes faster.
(Y/N) didn't think he'd go right to pounding her, but both enjoy the feeling.
"If we're going to have a baby, I'm glad you're the father," (Y/N) smiles.
Though Magnus would have rather the two talked about it first, Magnus hopes he's getting (Y/N) pregnant.
"I love you so much," he says, "I hope there will be a little one on the way," he rubs her abdomen, wishing there was a way to find out now, but even Ratchet wouldn't be able to know for a few weeks.
The fun ends, and the two cuddles until they fall asleep.

Wheeljack watches Magnus walk out of the ground bridge with (Y/N) on his shoulder. He thought Magnus was going to scold him as Magnus approached him.
"Thank you," Magnus says before walking to (Y/N)'s room.
"Uh... you're welcome."
"Well, it seems those two are happy," Ratchet observes.
"Which means they—."
"Does it matter?!" Ratchet scolds, shaking his helm.
"It's none of our business," Optimus adds, "but we might find out in a few weeks."
The other two mechs smile, thinking about the possibility of a human sparkling around the base.