https://www.dlsite.com/maniax/work/=/product_id/RJ256998.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_156943/

Pages 2-112 : Text
Pages 113-206 : Textless

大廠的質量

Base +13, selece4400 -6

居然是happy end

Base +6

Huh. The father of the child was a teacher not depicted in the fiction? 'Shakai' (Society)--I count 'Chiri' (Geography) (page 11), 'Eigo' (English) (page 35), 'Seibutsu' (Biology) (page 45), and 'Suugaku' (Maths) (page 62). The Japanese teacher was mentioned as not being male (page 43). Did I miss a teacher? Page 108 suggested that the child was made with the Maths teacher who slept with her every time after teaching her Maths, but then in 111 that twist ending? Or the use of that 'de', does she have a reason to pretend that it's his (money?), even though it's actually the Maths teacher's..?

Base +15, Magiragi +5, dkgohoz +4

@Multipartite
Perhaps it is the child of a social studies teacher that she is actually pregnant, but marriage is seen as having a math teacher. However, we cannot rule out the possibility that it could be an NTR ending married to a social studies teacher.

Base +5, Magiragi +5, dkgohoz +4

中间不是数学老师的吗。。。结果。。。最后居然是和社会科目老师的孩子？

Base +6