A little doctor's help
Three is a crowd, but four is a party.Namjoon suggested to Seokjin that the gynecologist that would lead Jungkook's pregnancy was their college years friend Yoongi, who had been close with the family for decades now. Yoongi meant total secrecy, they could trust him.Yoongi was also a lot of fun.
OR;NamJin take their pregnant son Jungkook to see Yoongi, an old family friend and a doctor. Fun (and medical kink) ensues.(Yoongi is a submissive alpha, slight dom!Namjoon undertones)