B.W.
Congratulations on breastfeeding your twins! Thats incredible!
Since you pump, I would take those 'feedings' out first. Stop pumping one session a day for a week. The next week, stop another pumping session, and then the third week, stop that last one. If its too painful, go two weeks before dropping another pumping session. Basically at this point your body will easily adjust to milk intake, its an 'expert' at regulating now, so dropping one pumping session a week will allow your body to adjust slowly, decreasing milk without you becoming engorged.
Then, go ahead and continue nursing them in the morning for as long as you all desire. My boys nursed well beyond a year, but after around 15/16 months they only nursed in the AM and at bedtime. Around 18 months they were waking up not interested in nursing so we just stopped that one too unless they asked for it, and only nursed at bedtime for a loooong time after that. :)
If you want to cut the morning nursing too, then do the same thing with cutting out that morning session.
Also, I would just get rid of the bottle at this time too, or they will use that as a replacement comfort object. Stick with a sippy cup, straw cup, etc and ditch teh bottle.