No erection during foreplay/ suck

My new boyfriend was fingering me so good oh boy I was wet like crazy and I orgasmed with hand job if you could call it that way. So whilst fingering he kissed my tits and my navel I tried giving him head but he was not getting hard as expected but just a bit to stand up not firm enough for penetration. We did not have or have had no sex yet because we want to wait a bit . Should I be worried . FYI if it matters he has a huge machine which am looking forward to have in me . Could I be worried that the machine