<human>: I started dating someone in mid-December. We met online, went out for dinner a few times, then starting hanging out at their place regularly after maybe 2-3 weeks (give or take). We have (amazing) sex every time we see each other (2-3x a week), and have been opening up more emotionally as time goes on.

I really like this person and would like to see each other exclusively (I haven't been with anyone else since February, while they still maintain an active online dating profile), since I know we both are looking for a long-term relationship. 

My problem is this...I have never had to start this conversation before. I get the feeling that they would also like to keep me around for awhile (vague statements about "we should do this over the summer..."), but no mention of what exactly we're doing here. Every other relationship I have been in, the other person brought it up way earlier and I feel like I don't have much time left to get that commitment before they grow bored/tired of waiting and move on. They are in the middle of a big project at work that requires late hours and weekends (software engineer), that is due to wrap up within the next week or so...maybe they're waiting until then to focus on an actual relationship? I don't know. 

I'm losing focus on my point. Help me Reddit, how do I get this conversation rolling?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I'm too shy to function, how do I ask someone I've been dating for nearly 4 months to be my girlfriend/boyfriend?