Just a Little Wickedness by Merry Farmer

Lord Alistair Bevan, Viscount Farnham, has the weight of the world on his shoulders. With his father’s health failing, the time has come for him to find a wife, produce an heir, and do his duty. But Alistair knows a traditional life is not for him, especially when a chance meeting with valet Joseph Logan turns his world upside down.
Joe Logan came to London in search of his missing sister, Lily. But months have passed, and not only is Lily still missing, more children have disappeared as well. The trail of the missing children might be growing cold, but things are just starting to heat up between Joe and Alistair.
When both Alistair and Joe seek out the help of The Brotherhood—an underground organization dedicated to helping the gay community—they are drawn into a much deeper investigation of children who have gone missing all over London. When it begins to look like people very close to Alistair’s family are involved, Alistair finally has a chance to make his father proud. But will the wild and wicked love blossoming between Alistair and Joe help them find Lily, or will their affair be exposed and destroy both of them?