I would like an increase in breast volume without a lift to maintain swinginess, what would you suggest? (Photos)

Although only skin is typically removed in a breast lift procedure
that is a few grams, the breasts will appear smaller. This is due to the
fact that the same mass is wrapped in a smaller soft tissue envelope
and increases the density. The less dense the breast and the more the
surface area of skin that is removed, the larger the apparent reduction
in size. Fat transfer or a small breast implant can be used to achieve
upper pole fullness if necessary.
The vertical or lollipop lift can be used for severe droopiness. This lift involves a vertical and a periareolar incision.  Consult with a board certified plastic surgeon to determine if this is the right lift for you to achieve your ultimate goals.

Based on your photos I do not recommend having implants without a lift.  I don't think you'd be happy with the results.  However I do think you'd have a nice outcome with an augmentation and lift.  See a board certified plastic surgeon near you to learn more.