Lynne doesn’t read this trope, but here are all the mpreg fics that have been shared through the library. Here are my personal favorite long ones.
Not As It Seems by Fearlessy
Blaine had been frozen where he stood. The boy in front of him was gorgeous. He had never seen a creature so beautiful in his life and quite frankly, Blaine was awestruck. His eyes, they were like raging ocean storms yet they were gentle, inviting, and so utterly … organic.
Hold My Heart by Xx-Erin-xX-AthrunxCagallifan
GKM Fill: Blaine is a carrier who is sold by his parents when they are in need of money. He is gifted to Kurt by his buyer in order to gain favour with newly elected Congressman Hummel. M for obvious reasons, warnings for MPreg and some dub/non con.
Apple of My Eye by idoltina
A fill for this GKM prompt. AU after The Break Up. Blaine finds out that he’s pregnant after Kurt breaks up with him (with Kurt’s child, no less). He tries telling Kurt about it, but Kurt refuses to talk to him. Blaine decides to finish his senior year at home and give the baby up for adoption. Only he doesn’t. He ends up keeping the baby -- a daughter -- and takes her to New York with him when he leaves for college. He raises her partially on his own with some help from his parents, and tries to juggle parenthood, school, and work. And everything works out okay for a little over two years -- until he runs into Kurt.
Canon compliant with the show through the Klaine wedding, with the rather major twist that in this universe, men can become pregnant ... and Kurt learns Blaine is pregnant soon after the wedding. A little too soon, given the circumstances. This is a story about the power of love and family, and about the consequences of secrets.
The Anderson Rose by @missbeizy
In the mountains of what was once the Northeastern United States of America, the descendants of a band of refugees who had escaped New York City at the end of a great World War are beginning to thrive after almost a thousand years of struggle. Relying on a combination of bits and pieces of advanced technology salvaged from the remains of great cities, as well as the still-pristine forest that they now call home, the people of Westerville are determined to rebuild a world in which peace, love, and cooperation mean more than victory, greed, and wealth.
Wont Tell Anyone by karanoaoi
The Royal family has never had a problem securing their claim to the throne. That was until now. The King and Queen have been unable to bear any children passed their only son, Blaine. Now when their reign is threatened by other Nobel families that declare their family as weak, they turn to the one way they know that will show everyone their family line has not ended. Having their son marry and produce a strong line of heirs.
What I Call Life by WarblerSlushie
Kurt broke off the engagement and left Blaine. Three years later, Kurt's at a strip club for his bachelor party and sees Blaine working. Blaine's been working there and enduring uncomfortable glances and touches for a year to make sure that his son was properly cared for. MPREG.