If only I am his wife...

If only I am his wife...I am a terminal-sick-boy sister.My younger brother sufferedfrom cancer and can't survive long.He is only 19 years old.His only regret is that he has never tasted the fruit of love.He doesn't want to pass his life with this regret.As hissister,I really want to complete his hope by offering myverginality to him and don't let him regret being bornin this world.Is it justable from the moral aspect?I love him dearly.He is a cute and lovely boy.I don't want him go with regret.I want tohelp him fulfill his wish.