Unfortunately, it's a real cheesy one so there's probably a lot of similar ones out there.

• Couple having their first time. It's filled with awkward dialogue and the leads are reluctant.
• Really vanilla set-up.
• There's a joke in there about the girl buying lingerie specifically for the first time, only to have the guy remove it within the first few minutes of initiating sex.
• Some line about the guy also wanting a blowjob only to ignore it later in favor of vaginal.
• I think it was only sex, no foreplay. Forgotten condom and the whole responsibility spiel.

It'd be great if someone can help me on this, though. Also, thanks in advance.

Do you have more details?

Like you said, the plot is too common.

Maybe what's he MC or Heroine looks like, the artist style, the number of volume, licensed or not, etc?