Translation for chapter 5. Sorry my writing skill is hopeless and can't be cured, please bear with me.

The beginning of chapter 5 is a flashback where they were in elementary school, there was a school trip that day. The childrens talked about not being near Kei because him being an omega would lure people and it's troublesome, the only one who protected for Kei is Tsugitsugu said playing with an omega is not dangerous, Kei was really moved by hearing that and said Tsugitsugu that Kei would find a alpha soon, and he'd never bring Tsugitsugu any trouble so please be friend with him.
Coming back to the present, Kei was together with the Alpha, the Alpha complain that, despite him wanting a child with his 13th lover ( Kei is 13th lover ) Kei went as far as taking emergency contraceptive pill. The alpha wanted to give Kei a new high class apartment as well as living expense. Then he laughed and said he wanted to have sex but since Kei didn't want that, he stopped by saying he would not do it by force either.
When Kei was alone, he felt relieved that he didn't get pregnant with that alpha, he had money and other luxuries but why he felt so empty and lonely inside.

Next scene was about Tsugitsugu, during work he remember that day was the day Kei was in heat, and felt worried but tried to not think about that. However, after seeing the alpha was flirting with another omega in front of his eyes, he got angry and yelled at the alpha that he had to be by Kei's side now since he may be in heat now, the alpha laughed and told him that he had many lovers so he couldn't care for any particular person, then he said if Tsugitsugu was that worried for the Omega, how's about getting down on his knee in front of the Alpha, he would tell him Kei's new address.

Coming back to Kei, he's in heat and had to took the medicine 3 days in a rows, suffering the negative effect. He was sad seeing Tsugistugu and asked him to leave, but Tsugistugu told him that " I didn't give up on you for this. Since now on, I act on my will " . Hearing that Kei cried and said " you already did what you want and left alone this useless omega ", Kei wanted Tsugitsugu to fuck him so hard that he could bear Tsugitsugu's baby, Tsugisugu was stunned hearing that cuz after being biten by a alpha, Omega would not be able to accept anyone else ( their bodies achy, vomit, headache and so on ). However, Kei reassured that if that's with Tsugistugu then he can make it slowly.
Kei told Tsugitsugu to tied him up and make love with him, so his body could not hurt Tsugitsugu. Tsugitsugu was upset seeing how Kei was suffering while having sex with him, then Kei asked him to stroke his face and saying " I love the most whenever you're doing this for me. " then Kei wanted Tsugistugu to come deeper in him, so he could get pregnant his child, he'd be content just with that and would take care of the child own his own. Tsugitsugu was angry hearing that, he were not that irresponsible and asked Kei for marriage.

Later, Kei refused the Alpha saying he's getting married, the Alpha was really suprised telling Kei that was the first time his omega was stolen by a Beta.

In the last part of this chapter, when Kei was doing house work, Tsugistugu told him that he shouldn't do everything, he would share the housework with him. Then Kei smiled and told him that he didn't have to mind that, as a husband he just needed to care for his work at the company, and his most happiness is to be Tsugistugu's wife, even though he often worried that he didn't deserve to be his wife, but from then on, he would stop thinking about that and just try his best to make Tsugistugu happy.