How do I tell my boyfriend I'm ready for sex?

eleanor
I'm ready to have sex with my boyfriend now but it would be my first time and I don't know how to tell him. I'm quite shy and he knows that and I don't want to just straight out say that I want to have sex with him but I also want to let him know somehow (preferably subtly). Any ideas in how I could casually slip a hint into the conversation?