Interhouse Teamwork for Successful Pregnancy

Harry and Draco's magic isn't compatible enough for them to have children together, and that's becoming a problem. Leave it to the Slytherins to come up with a perfect plan and coaxing the Gryffindors to do all the work. Mpreg, instinct-forced infidelity, some sort of foursome, bottom!Draco, Veela!Draco, Established Relationship, Plotting Slytherins