My Wife Refuses To Give Me Blow Jobs

My hotwife has only EVER sucked my penis twice, and that was shortly after we first met. It's been almost 4 years since I got a blow job. The thing is, the guy that she was with before we met, she always sucked his cock, as well as other guys she dated. She's never verbally refused to do it with me, rather she shows absolutely zero interest in doing it. Just things that I think about as I sit here with my penis locked in it's chastity cage....