Hope these are what you're looking for!
http://www.mangago.me/read-manga/k_sensei_no_yaban_na_renai/ (Seme Pushy for sex - editorxwriter)
http://www.mangago.me/read-manga/dekiai_itokon/ (Seme wants sex but more gentle - cousins!)
http://www.mangago.me/read-manga/fushidara_na_hanatsumi_otoko/ (Seme VERY PUSH FOR SEX - relatives!)
http://www.mangago.me/read-manga/houyou_jikken/ (Seme somewhat pushy for sex - cousins!)
http://www.mangago.me/read-manga/katekyo/ (Student x Teacher)
I hope you enjoy! (づ￣ ³￣)づ
You're a lifesaver mah friend! (づ￣ ³￣)づ
Anytime my dear!
So umm i have a thing for mangas where seme is really pushy to have sex with the uke but the uke is resisting(but of ofcourse he also wants it) because the seme is either hisstudent/underage/likeabrothertohim/childhoodfriend/friendofhisbrother/cousin etc.. but then ended up having sex anyway because the uke cant really fight with the seme because he's already feeling good of the seme is really strong for him to resist. You see, i get really excited whenever i read manga like these.(≧∀≦) any recommendations eii??