Lack of sex

Me and my boyfriend have been dating for almost 2 Years now. He is 2 years older than me and we are both still virgins. I’ve always wanted to have sex but he used to want to wait till marriage. He has now changed his mind and says he wants to have sex with me as soon as we get the chance. The thing is, we’re never alone. I’m always at his house and he’s always at mine and we both have stay at home mothers, so we’re always cock blocked basically. The one time we have the opportunity to be alone and have sex, he doesn’t want to do it Bc he doesn’t want to lie to his parents and loose their trust... it’s just frustrating Bc I would lie to my parents so me and him would have alone time, since we never do! I just feel like there’s something else that is pulling him back. And I don’t wanna bring it up and then he becomes all defensive and shuts me out. I just really want to have sex with him🙄