Can I just get implants with grade 2 ptosis? (Photo)

The rate of sagging you have would probably make a breast lift necessary, since your areolae/nipples are located well below your breast crease. Breast augmentation will enhance this sagging, and the implants may sit too low on your chest. The weight of the implants will also speed up the sagging of your breasts, making a lift inevitable in the nearer future.

Patient concerns regarding the appearance of their breasts can typically be divided in two pools: volume, ptosis (droop). The procedures to address these issues are as different as the issues themselves. However, these concerns are not mutually exclusive (some want smaller less droopy breasts and others want larger less droopy breasts).
There are two factors which can help to answer the question of which surgery will deliver the most satisfying result: mastopexy, augmentation or both. Patients must first consider the position of the NAC (nipple areolar complex i.e. the pigmented portion of the breast) as it relates to the inframammary crease. If the nipples are at or below the level of the crease the patient may benefit from a lift or mastopexy. The breast lift is designed to elevate sagging breasts to a more youthful position. It also helps to reshape and tighten the skin of the breasts. This is typically accomplished via a periareolar (around the nipple) incision with or without a vertical incision.
Mastopexy is an effective way to address sagging breast, however, the changes which accompany weight loss or pregnancy can also decrease volume of the breasts. When a woman wants the volume restored, or increased, a breast augmentation will also be needed in conjunction with mastopexy. Augmentation can help restore the volume loss which is well known to women following children. There are a number of options available to women considering augmentation ranging from size and implant type to access incision.   
A breast augmentation alone may be appropriate if ptosis is mild. If the patient is comfortable with the natural appearance of the breasts but desires them to be larger, a breast augmentation alone is the right procedure.  Augmenting significantly ptotic or sagging breasts tends to magnify the problem. In these cases, a mastopexy performed in conjunction with an augmentation is preferred.
Based upon your photo/description, you would benefit from a lift. However, if your goal is volume only an augmentation may be appropriate. However, you must remember, the implant will not provide a lift. This is irrelevant when clothed and wearing a support garment. In my experience, patients are typically disappointed when they have foregone a lift when it is needed. As long as your expectations have been adjusted, an implant alone is not unreasonable.
There is a procedure for every problem. To determine which technique is right for you, consult with a board certified plastic surgeon (ABPS). Patients should discuss their concerns with their physicians in order to make an educated decision.

Breast implants alone will give volume to the breast with a limited lifting of the nipple.  For the best cosmetic results in ptosis, frequently augmentation is performed with a breast lift.  A breast lift usually is performed at the same time as implant but can be performed later if the drooping is bothersome.  Realistic expectations are important.  One doesn't want a "snoopy" breast with the natural breast tissue sagging below the breast implant.