Grandmother's Love

I'm Donald 22 and live with my only living relative Rhonda 60 widow. Both my mother Heather and father Richard along with his parents died in a car accident 4 years ago. Being an only child Heather had married Richard also an only child and when they died only Rhonda was still alive on either sides of our family. I'm not the greatest when it comes to having relationships, I do get lucky sometimes. Rhonda keeps telling me she loves me dearly and during the last lockdown, I asked her to sleep with me. She was really shocked at first and refused, but I persisted and wore her down. I kept telling her it wouldn't hurt anybody and no others besides us would know. Finally she agreed to let me fuck her just once. But after I had fucked her I wanted her even more, now we fuck almost every week. Rhonda even asks for sex now and then and we sleep together every night.