Also, expecting some revelation on Erza and Eileen part. Instead we got a new member of the Dragneel family, Hiro's trolling magic is effective as always.
It implies sexual pleasure. If you read the actual japanese text you'd understand that it explicitly refers to 'forbidden pleasure'.
That aside, as a Fairy Tail lover I honestly love this chapter. It felt so fresh and hilarious. This is the first time ever that I've seen a manga which addresses the virginity of its characters specifically. Fairytail has never been serious since the start and I don't get why people are complaining so much.
Your argument is invalid since it affected Rogue and Laxus. Gajeel is maybe Cobra are probably affected as well.
Rogue is affected because he banged Minerva (this ship was developed long time ago), but since Yukino wasn't affected, Sting hasn't got his hands on her yet.
When the main series becomes a doujinshi itself, lol.
As shown by FT, Kubo's mistake wasn't that of pointlessly prolonging the manga with forgettable battles and characters, his fault was not drawing enough tits and asses.