I think you might have been better off starting a new thread instead of replying to this one, but we're here now, so I'll give you the best answer I can.

The only dimensions you've given us are length; do you know the diameter or circumference of the dildo you were using? And can you take a measurement of the diameter/circumference of the head of your boyfriend's penis?

It all comes down to stretching. If you had at least one toy that was between the diameters/circumferenc es of the original dildo and your boyfriend's cock, you might be able to stretch yourself out, train yourself to a midpoint where taking it might be difficult, but doable. I'm having a similar issue taking an oversized dildo I have; that's my strategy for working past the issue.

Just bear in mind that you'll need to keep it exercised once you've stretched out to that point, or you'll start having difficulties taking something that large again as you tighten back up. But it sounds like once you get yourself stretched out enough to take him, that that won;t be a problem.