Bokuto x Reader

When you turn 18 you stop ageing until you meet your soulmate- sometimes you have to wait a few years at most.
And the most unfortunate have to wait life times.

You have lived a long time, long enough for your family to grow old and leave you alone. You move to Japan for work and people who won't recognise you. But when a single mother -having lost her husband and soulmate- moves in next door with her son, Bokuto Kōtarō. You might have found someone worth staying for.

or

You're a super old loner in an 18 year old body waiting for your soulmate but instead you get a Bokuto Kotaro and helping his single mother raise him to 18. Struggles and trouble ensues with a strangely protective Bokuto and a very sad very lonely reader, waiting for precious Bokuto to reach 18 and leave them behind for his soulmate.

Characters not mine- only the story.